21404335323 has 16 divisors (see below), whose sum is σ = 33150822656. Its totient is φ = 12030539040.

The previous prime is 21404335307. The next prime is 21404335339. The reversal of 21404335323 is 32353340412.

It is an interprime number because it is at equal distance from previous prime (21404335307) and next prime (21404335339).

It is not a de Polignac number, because 21404335323 - 2⁴ = 21404335307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21404335223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8353261 + ... + 8355822.

It is an arithmetic number, because the mean of its divisors is an integer number (2071926416).

Almost surely, 2^21404335323 is an apocalyptic number.

21404335323 is a deficient number, since it is larger than the sum of its proper divisors (11746487333).

21404335323 is a wasteful number, since it uses less digits than its factorization.

21404335323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16709154.

The product of its (nonzero) digits is 25920, while the sum is 30.

Adding to 21404335323 its reverse (32353340412), we get a palindrome (53757675735).

The spelling of 21404335323 in words is "twenty-one billion, four hundred four million, three hundred thirty-five thousand, three hundred twenty-three".